The Dropbox app stores a local cache plus any files you've made available offline, which together can take up significant space. You can clear both without losing anything, your files stay safe in Dropbox's cloud.
Short answer:
- Android: Settings > Apps > Dropbox > Storage > Clear cache (safe, temporary files only).
- In-app (iPhone and Android): remove offline files and camera-upload copies you no longer need locally.
- Avoid Clear data / Clear storage on Android, which signs you out; your cloud files are never deleted by clearing the cache.
Why Dropbox Takes Up Space on Your Phone
Dropbox storage on your phone comes from three places: the cache (temporary previews and thumbnails), offline files you've marked to access without internet, and camera uploads waiting to sync. The cache grows as you browse and preview documents; offline files take the most space because they're full copies stored locally.
To see the breakdown on Android, go to Settings > Apps > Dropbox > Storage and look at the Cache and User data figures. On iPhone, check Settings > General > iPhone Storage > Dropbox and review Documents & Data.
The key reassurance: everything in Dropbox lives in the cloud. Clearing the cache or removing offline copies never deletes the actual files, you can re-download them anytime.
Clear Dropbox's Cache From Inside the App
Dropbox has a built-in cache-clearing tool that works on both iPhone and Android.
- Open Dropbox and tap the account icon (or menu).
- Tap Settings.
- Scroll to Clear cache (sometimes under a storage or advanced section).
- Tap it and confirm.
This removes temporary previews and thumbnails only. Your files, offline files, and login all stay intact, and Dropbox rebuilds the cache as you browse. It's completely safe and the best first step.
Clear Dropbox's Cache via Android Settings
On Android you can also clear the cache from system settings.
- Open Settings > Apps.
- Tap Dropbox.
- Tap Storage (or Storage & cache).
- Tap Clear cache.
This is safe, it only removes temporary files. Do not tap Clear data / Clear storage next to it: that resets Dropbox to a fresh install, signs you out, and removes your offline files locally. You'd need to log back in and re-mark offline files. Your cloud files are never deleted, but it's an unnecessary step for routine cleanup. See clear cache vs clear data on Android for the full distinction.
Remove Offline Files You No Longer Need
Offline files are the biggest local space user in Dropbox, because they're complete copies stored on your phone.
- In Dropbox, open the Offline section (or browse to a file marked offline).
- Tap the three-dot menu next to a file or folder.
- Turn off Make available offline.
The file instantly stops taking local space and stays safe in your Dropbox cloud, ready to re-download when you need it. Review your offline list periodically and keep only what you genuinely need without internet.
Manage Camera Uploads and Downloads
Two other sources of Dropbox-related storage are worth checking.
- Camera uploads: If enabled, Dropbox copies your photos and videos to sync them. The originals still sit in your gallery, so once they're safely uploaded you can remove local duplicates. Review camera-upload settings under Settings > Camera uploads.
- Downloaded files: Files you've exported or saved from Dropbox land in your phone's Downloads folder and count separately. Clear old ones in your file manager.
These reclaim space outside the Dropbox app itself.
Keep Dropbox (and Your Phone) Lean
A short routine keeps Dropbox storage in check:
- Clear the cache every few weeks via the in-app option.
- Review offline files and turn off any you no longer need locally.
- Check camera uploads and remove local duplicates once synced.
Clearing Dropbox helps, but offline copies and camera uploads often leave duplicates across your phone. A review-first tool like Cleanor for Android (or Clenoir for iOS) scans on-device and surfaces large videos and duplicate photos, showing everything before you confirm a deletion. For more, see the clean up phone storage guide and the storage cleanup FAQ.
With the cache cleared and offline files trimmed, Dropbox keeps your files a tap away while taking far less space on your phone.
Want the fast version? Cleanor for iPhone scans on-device — nothing uploaded — and surfaces your largest videos, duplicate photos, and heavy caches in one pass. For the full routine, see the free up phone storage guide.
FAQ
Does clearing the Dropbox cache delete my files?
No. Everything in Dropbox lives in the cloud, so clearing the cache or removing offline copies never deletes the actual files. Clearing the cache only removes temporary previews and thumbnails, which Dropbox rebuilds as you browse.
How do I clear the Dropbox cache on Android?
Go to Settings > Apps > Dropbox > Storage (or Storage & cache) and tap Clear cache. This is safe because it only removes temporary files; avoid the Clear data / Clear storage button beside it, which signs you out and removes your offline files locally.
What takes up the most local space in the Dropbox app?
Offline files are the biggest local space user because they are complete copies stored on your phone. To remove one, open the Offline section, tap the three-dot menu next to the file or folder, and turn off Make available offline, which frees the space instantly while keeping the file in your cloud.